'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528 // dev port

// 通过环境变量 来区分是否使用cdn
// ENV或者NODE_ENV都可以
const isProd = process.env.ENV === 'production' // 判断是否是生产环境
let externals = {}
let cdn = {
  css: [],
  js: []
}
// 只有生成环境才需要做包的排除和使用cdn代替
if (isProd) {
  // 生成环境的接口服务器
  externals = {
    // 对象的属性名：我们所安装的包的名称，可以在package.json中查找
    // 对象的属性值：前面的模块在CDN文件中的全局变量名（要求CDN中的文件版本跟我们当前项目的版本一致）
    vue: 'Vue',
    'element-ui': 'ELEMENT',
    xlsx: 'XLSX'
  }
  // 配置CDN，将来在项目的入口index.html进行遍历使用
  cdn = {
    css: ['https://cdn.bootcdn.net/ajax/libs/element-ui/2.13.2/theme-chalk/index.css'],
    js: [
      // vue必须放在最前面
      'https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.min.js',
      'https://cdn.bootcdn.net/ajax/libs/element-ui/2.13.2/index.js', // elementUI
      'https://cdn.bootcdn.net/ajax/libs/xlsx/0.18.5/xlsx.mini.min.js' // xlsx
    ]
  }
}

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  // 服务器配置
  devServer: {
    port: port,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    // 代理设置
    // 前端：http://localhost:8888/#/login
    // 代理服务器api地址： http://localhost:8888/api/sys/login
    // 真正的接口服务器:   https://ihrm-java.itheima.net/api/sys/login
    proxy: {
      // 开发环境的接口服务器配置
      '/api': {
        // target: 'https://ihrm-java.itheima.net/', // 代理转发的目标服务器(接口服务器)
        // 测试环境的账号
        target: 'https://ihrm2-test.itheima.net/', // 代理转发的目标服务器(接口服务器)
        changeOrigin: true, // 是否跨域 需要设置此值为true 才可以让本地服务代理我们发出请求
        // 路径重写
        pathRewrite: {
          '^/api': 'api'
        }
      },
      // 生成环境的接口服务器
      '/prod-api': {
        target: 'https://ihrm-java2.itheima.net/',
        changeOrigin: true
      }
    }
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    },
    // 配置排除掉哪些模块不被webpack打包,开发环境为空对象，生成环境才使用上面的配置
    externals: externals
  },
  chainWebpack(config) {
    // 将cdn对象注入到html插件的属性cdn上
    config.plugin('html').tap(args => {
      args[0].cdn = cdn
      return args
    })

    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [{
      rel: 'preload',
      // to ignore runtime.js
      // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
      fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
      include: 'initial'
    }])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module.rule('svg').exclude.add(resolve('src/icons')).end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development', config => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [{
          // `runtime` must same as runtimeChunk name. default is `runtime`
          inline: /runtime\..*\.js$/
        }])
        .end()
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial' // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true
          }
        }
      })
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single')
    })
  }
}
